Figure 4
Neural summation and spike generation in a LIFL neuron. (a) Input/output process scheme, with firing equation curve (\(a=1\), \(b=0\), \(c=0\)+). (b) Temporal diagram of LIFL operation (basic configuration). Excitatory (inhibitory) inputs cause an instantaneous increase (decrease) of the inner state. When S exceeds \(S_{th}\) the neuron is ready to spike; due to the latency effect, the spike generation is not instantaneous but it occurs after \(t_{f}\). (c) Effect of the arrival of further inputs when the neuron is overthreshold. An excitatory synaptic pulse is able to (left) anticipate the spike generation (post-trigger anticipation); an inhibitory synaptic pulse is able to (center) delay the spike generation (post-trigger postponement), or (right) to cancel the spike generation (post-trigger inhibition). The state evolution in the simple case of no further inputs is reported in grey.
